(expand_divmod, case TRUNC_DIV_EXPR): Only reject

larger-than-HOST_BITS_PER_WIDE_INT modes for general constants,
not for powers-of-2.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@10727 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/expmed.c b/gcc/expmed.c
index b89a5f8..4341b99 100644 (file)
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -2835,7 +2835,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
       {
       case TRUNC_MOD_EXPR:
       case TRUNC_DIV_EXPR:
-       if (op1_is_constant && HOST_BITS_PER_WIDE_INT >= size)
+       if (op1_is_constant)
          {
            if (unsignedp)
              {
@@ -2870,7 +2870,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
                    if (quotient == 0)
                      goto fail1;
                  }
-               else
+               else if (size <= HOST_BITS_PER_WIDE_INT)
                  {
                    /* Find a suitable multiplier and right shift count instead
                       of multiplying with D.  */
@@ -2936,6 +2936,8 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
                                                 tquotient, 1);
                      }
                  }
+               else            /* Too wide mode to use tricky code */
+                 break;
 
                insn = get_last_insn ();
                if (insn != last
@@ -3029,7 +3031,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
                                                quotient, quotient, 0);
                      }
                  }
-               else
+               else if (size <= HOST_BITS_PER_WIDE_INT)
                  {
                    choose_multiplier (abs_d, size, size - 1,
                                       &ml, &post_shift, &lgup);
@@ -3081,6 +3083,8 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
                                                    tquotient);
                      }
                  }
+               else            /* Too wide mode to use tricky code */
+                 break;
 
                insn = get_last_insn ();
                if (insn != last